The resource utilization of massive amount of cow dung (CD) generated from modern animal husbandry is crucial for sustainable development. Converting CD into porous biochar for energy storage represents a promising strategy for high-value utilization. However, the application of CD-derived biochar for efficient hydrogen-storage remains challenging, primarily due to the difficulties in the controllable fabrication of microstructures and the unclear structure-performance relationship. To address these issues, this work presents a synthetic strategy involving KOH activation coupled with ultrasound-assisted technology to fabricate porous biochar from CD with tailored microporous structures. The optimized biochar exhibits ultra-high specific surface area of 2850 m 2 ·g –1 and large pore volume of 2.31 cm 3 ·g –1 , leading to a remarkable hydrogen uptake capacity of 4.08 wt% at 77 K and 40 bar. A strong linear correlation was established between hydrogen storage capacity and micropore surface area, underscoring the critical role of micropores, especially at low pressures. Furthermore, first-principles calculations reveal enhanced H 2 binding with N/O heteroatoms. RDG and EDA provide qualitative and quantitative insights into the physical adsorption nature. Finally, kinetics calculations with several adsorption and diffusion models confirm rapid hydrogen diffusion and equilibrium within biochar, highlighting its excellent kinetic performance for practical hydrogen-storage. • Sustainable utilization of Cow Dung: Cost-effective and sustainable method for synthesizing porous biochar with ultrasound-assisted technology • High surface area and hydrogen storage: Specific surface area 2850 m 2 /g and rich pore structure with hydrogen storage capacity 4.1 wt% • Microstructure-activity relationship: Revealing correlation between the structure and hydrogen capacity • Theoretical and kinetic insights: Elucidated hydrogen storage mechanism through DFT calculations and kinetic models
Hong et al. (Sun,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: